Boston Mayor Marty Walsh announced on Wednesday that the speed limit on city streets will be reduced.

Effective Jan. 9, the speed limit will be reduced from 30 mph to 25 mph.

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City officials said that the combined efforts of Walsh, the Boston City Council, Gov. Charlie Baker, MassDOT and Massachusetts State Legislature will improve road safety for walkers, drivers and those bicycling on city streets.

State-owned roadways in the city of Boston will not be affected by the new law.

"I am pleased that our hard work and commitment to creating safer roadways for all users by reducing the default speed limit to 25 mph will become a reality in January," Walsh said. "This is an important milestone in our Vision Zero efforts of bringing the number of traffic-related deaths to zero, and with approval of this petition, we are one step closer to achieving that goal."

City officials said Boston Transportation Department teams are auditing existing speed limit signs and will install new signs as necessary. The 25 mph speed limit signs will be posted at entrance points and other strategic locations in the city.

So far in 2016, at least 17 people have been killed in traffic crashes on city streets. Twelve of that number were killed while walking, and five were in a motor vehicle.